// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_IC_CALL_OPTIMIZATION_H_
#define V8_IC_CALL_OPTIMIZATION_H_

#include "src/api-arguments.h"
#include "src/objects.h"

namespace v8 {
namespace internal {
    // Holds information about possible function call optimizations.
    class CallOptimization {
    public:
        CallOptimization(Isolate* isolate, Handle<Object> function);

        Context GetAccessorContext(Map holder_map) const;
        bool IsCrossContextLazyAccessorPair(Context native_context,
            Map holder_map) const;

        bool is_constant_call() const { return !constant_function_.is_null(); }

        Handle<JSFunction> constant_function() const
        {
            DCHECK(is_constant_call());
            return constant_function_;
        }

        bool is_simple_api_call() const { return is_simple_api_call_; }

        Handle<FunctionTemplateInfo> expected_receiver_type() const
        {
            DCHECK(is_simple_api_call());
            return expected_receiver_type_;
        }

        Handle<CallHandlerInfo> api_call_info() const
        {
            DCHECK(is_simple_api_call());
            return api_call_info_;
        }

        enum HolderLookup { kHolderNotFound,
            kHolderIsReceiver,
            kHolderFound };
        Handle<JSObject> LookupHolderOfExpectedType(
            Handle<Map> receiver_map, HolderLookup* holder_lookup) const;

        // Check if the api holder is between the receiver and the holder.
        bool IsCompatibleReceiver(Handle<Object> receiver,
            Handle<JSObject> holder) const;

        // Check if the api holder is between the receiver and the holder.
        bool IsCompatibleReceiverMap(Handle<Map> receiver_map,
            Handle<JSObject> holder) const;

    private:
        void Initialize(Isolate* isolate, Handle<JSFunction> function);
        void Initialize(Isolate* isolate,
            Handle<FunctionTemplateInfo> function_template_info);

        // Determines whether the given function can be called using the
        // fast api call builtin.
        void AnalyzePossibleApiFunction(Isolate* isolate,
            Handle<JSFunction> function);

        Handle<JSFunction> constant_function_;
        bool is_simple_api_call_;
        Handle<FunctionTemplateInfo> expected_receiver_type_;
        Handle<CallHandlerInfo> api_call_info_;
    };
} // namespace internal
} // namespace v8

#endif // V8_IC_CALL_OPTIMIZATION_H_
